Extended my eastern bound (one way) by about 62 miles by biking to Ellensburg this weekend --- my previous record was the end of the Preston-Snoqualmie Trail, which I did round trip to about W 121 51.051 (just across the river from the falls where the trail dead ends.
New eastern boundary is near CWU in Ellensburg at W 120 32.121
I occasionally bike on the weekends with some guys who are older than me. Heck, older than Professor Dave. They had a plan to go to Cle Elum, which I extended to Ellensburg by taking a Cle Elum hotel room for one night. They semi-bailed at the last minute, but they did bike up to Hyak on the east side of the Snoqualmie Tunnel before they turned around, which meant my solo riding was all downhill and mostly with the wind at my back. When I got to Cle Elum, I was pretty tired. I ate a big BBQ dinner at Smokey's, which is right on the trail in South Cle Elum at the old railroad depot (and may be the best food for miles around - remember it next time you're going over the pass). Then I basically checked into my hotel room, bought some beverages at a nearby mini mart, and vegged out in my hotel room watching sports.
Sunday I took a short detour to Roslyn (3 miles in the wrong direction), then went back to Cle Elum and continued on the Iron Horse Trail to Ellensburg. Up to Hyak, the trail is nice, then it gets even nicer east of Stampede Pass Road, as it hasn't been re-graveled in a while but there isn't much traffic. So it's basically a nice dirt forest road that no vehicles ever take. But once you get to Lake Easton, the gravelling starts again and it rapidly gets annoying. It got bad enough east of Cle Elum that I bailed off the trail to Lower Peoh Point Road, which parallels it for a while, but then had to get onto the trail for a stretch that follows the Yakima River on the south bank. Torrey says Highway 10 on the north bank is nice, but this trail stretch is super nice - lots of trees for the most part, the river, pretty good trail conditions and next to no one else (I did see one mountain biker). Note: there are no legal campsites on this stretch but it's hard to see how you'd be caught if you tried to stay there overnight.
Once the trail got near Thorp, it crossed a few roads and became super gravelly again. I got off it at Highway 97, which is about as soon as you can, and took 97 then 10 into Ellensburg. My wife picked me up there Sunday afternoon.
A few notes:
The Coal Mines Trail from Cle Elum to Roslyn exists but has a lot of gravel. If you don't enjoy sliding around in gravel, just take the road.
The Iron Horse Trail is like a superhighway to recreation for bikers - you pass by all the trails south of I-90 on the way up to the Pass (except you're already a few hundred feet up), then once you hit Hyak, you have all of I-90 at your disposal: Salmon La Sac, Lake Keechelus, the Yakima Canyon, Teanaway, Blewett Pass if you want to go there. And the price is basically 1500 feet of climbing from Cedar Falls in 20+ miles. Definitely something to consider if you want to do a bike tour east of the Cascades.
I took my road bike with my standard 28mm tires and didn't have a problem, up to a point. If you're going much past Easton, I'd use a mountain bike to handle the gravel better. I was also carrying only a handlebar bag (one advantage of staying at a hotel).
The Iron Horse Trail has restrooms in lots of places, as well as camping up to Lake Easton, but then facilities become scarce. If you want running water, it's available at Cedar Falls (the Cedar River Watershed Education Center, run by Seattle Public Utilities, so it has the *best* water), Hyak, Lake Easton State Park, and otherwise at town stops like Cle Elum, Thorp and Ellensburg. Best to fill up your water bottles while you have the chance.
Despite the supposed Mountains to Sound Greenway, there isn't a good path up to Cedar Falls along I-90 --- you can get to Preston pretty easily on trails, but there is no good route from Preston (exit 22) to North Bend (exit 27). The group I was with was in a hurry, so we took the freeway (legal east of Issaquah), from the east end of Issaquah to exit 31. The freeway is vaguely safe, but super loud, dangerous at the exits, and full of debris on the shoulder where you bike. Plus generally unpleasant. Here are my thoughts on alternatives:
If you live farther north (like I do), get out to Redmond however you like (BGT to Lake Sammamish Trail, or just take a bus to the Redmond Transit Center), then take 202 (Redmond-Fall City Road) to Fall City and find your way onto the Snoqualmie Valley Trail, which ends right where the Iron Horse Trail begins at Cedar Falls.
If you have to take I-90, you can consider taking a bus to North Bend. If you want to bike it the whole way, getting to Preston via the Issaquah-Preston Trail is obvious. Then you could take the Preston-Snoqualmie Trail to Lake Alice Road and backstreets to Snoqualmie Ridge down to the SVT. But this involves taking your bike up these switchbacks:
(However, do note that the Preston-Snoqualmie Trail is paved, except near the switchbacks).
Honestly, I'd just get to Preston, then take the freeway to exit 27 (North Bend Way/Snoqualmie Casino) or 31 (202/N Bend Blvd). The uphill grind from exit 22 to 25 is pretty unpleasant, but once you're there, it's all downhill. North Bend Way seems like a nice downhill into downtown North Bend, where you can find the SVT, or just go downhill on the freeway to exit 31, which is a few blocks from downtown.
Photos: